2020 Lexus LX570 Cruise Control Isn't Working

Common Causes of Cruise Control Malfunctions in Your 2020 Lexus LX570 and How to Fix Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
30% chance it's the
Sensor
0%
25% chance it's the
Control Module
0%
25% chance it's the
Throttle
0%
20% chance it's
Something else
The most common reasons a 2020 Lexus LX570 cruise control isn't working are failed control module, sensor or switch issues, or throttle actuation problems.
  • Sensor: A faulty or malfunctioning sensor can lead to incorrect readings, causing issues with engine performance or other systems relying on accurate data.
  • Control Module: A faulty control module can lead to erratic vehicle behavior or failure of various electronic systems due to improper signal processing.
  • Throttle: A faulty throttle body or a defective accelerator pedal position sensor may be causing inconsistent throttle response.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2020 Lexus LX570 cruise control isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

In the event that a wheel speed sensor fails, the ABS, traction control system (TCS) and manufacturer specific stability control system lights will illuminate, informing the driver that the systems are disabled. The vehicle will be more prone to tire slip, and normal driving patterns may need to be adjusted to correct for the loss of computer control. On older vehicle's, the speedometer can be affected, causing illumination of the check engine light as well.

The cruise control switch can cause complete failure of the cruise control feature, but in a lucky scenario only partial functionality will be lost. This means that the cruise control may come on, but that it will not increase in speed automatically, or the cancel button does not work leading the driver to cancel cruise control with the foot brake. In some vehicles, the cruise control light may illuminate, or a warning message may be displayed due to lack of functionality.

What steps should I take to diagnose the cruise control issue in my 2020 Lexus LX570?

To effectively diagnose the cruise control issue in your 2020 Lexus LX570, start with a systematic approach that prioritizes simpler checks before moving on to more complex diagnostics. Begin by inspecting the cruise control fuse, as a blown fuse is a common and easily fixable problem that can disrupt the system's functionality. Next, examine the cruise control buttons on the steering wheel to ensure they are operational, as faulty buttons can lead to unresponsive controls. If these initial checks do not reveal the issue, utilize an OBD-II scanner to identify any error codes that may indicate specific malfunctions within the cruise control system. Following this, assess the speed sensors, which are vital for the cruise control's performance, ensuring they are functioning correctly. Additionally, inspect the wiring connections associated with the cruise control system for any signs of damage or loose connections, as these can significantly impact performance. Finally, if all else checks out, test the cruise control module itself, as a malfunction here could be the root cause of your issues. By following this structured diagnostic approach, you can efficiently identify and address the underlying problems affecting your cruise control system.

What are the common problems that could cause the cruise control to stop working in a 2020 Lexus LX570?

When troubleshooting cruise control issues in a 2020 Lexus LX570, it's essential to consider several common problems that may be at play. A faulty speed sensor is often the culprit, as it plays a critical role in relaying accurate speed information to the cruise control system. If the speed sensor is malfunctioning, the system may fail to engage or maintain the desired speed. Additionally, the brake light switch can cause disruptions; if this switch is not functioning correctly, it may inadvertently deactivate the cruise control when the brakes are applied. Another area to inspect is the throttle actuator, which controls the engine's throttle opening; any malfunction here can hinder the cruise control's ability to maintain speed. Electrical issues, such as blown fuses or wiring problems, can also lead to cruise control failure, so checking the electrical connections and components is vital. Lastly, vacuum leaks within the cruise control system can result in a loss of pressure, affecting its performance. By systematically examining these areas, DIYers can identify and potentially resolve the issues affecting their cruise control system.

How urgent is it to address the non-functioning cruise control in a 2020 Lexus LX570?

When it comes to a non-functioning cruise control in a 2020 Lexus LX570, understanding the urgency of the situation is crucial for any DIY enthusiast. While it may not seem like an immediate emergency, neglecting this issue can lead to more significant problems down the line. A malfunctioning cruise control system can indicate underlying electronic or sensor issues that may compromise the vehicle's overall performance and safety. For those who frequently drive long distances, the convenience of cruise control is invaluable, as it helps maintain a steady speed, reduces driver fatigue, and enhances fuel efficiency. If left unaddressed, the problem could escalate, resulting in more extensive and costly repairs. Therefore, it is advisable to diagnose and repair the cruise control system promptly. This proactive approach not only ensures a safer driving experience but also preserves the functionality of your vehicle, making it a worthwhile endeavor for any DIY mechanic.

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